Many oncidiums don't do well in hot weather but there certainly are some that you can grow. In Florida I've found that mounting them on tree fern fiber or putting them in a wood basket with some big chunks or tree fern fiber works well. Outdoors they like to be watered often and dry quickly. Common hybrids like Onc. Sweet Sugar, Onc. Twinkle and Onc. Jiuhboa Gold (my favorite) have grown well for me in hot weather. The species Onc. sphacelatum grows like a weed in South Florida. Be careful buying oncidiums from California growers. Many of them don't tolerate hot weather.
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